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1 “DZ”型锅炉炉门框与水冷壁管联接部位的裂纹该型锅炉炉门框铁板与水冷壁管联接部位一般都采用点焊方式,如图1所示: 损坏形式多为沿水冷壁管纵向、在框铁与水冷壁管点焊部位产生裂纹。原因:损坏部位正处在炉膛二风室高温区,当关上炉门时,该部位受高温辐射(当煤种较差时,炉膛正压运行更为严重),炉门框铁受热膨胀;当打开炉门时,冷空气进入,该焊接部位急剧冷却,框铁快速冷缩。这样
1 “DZ ” type boiler furnace door frame and the connection of the water-cooled wall tube cracks This boiler boiler door frame and water-cooled wall pipe joints are generally used spot welding method, as shown in Figure 1: Mostly damaged form along the water Longitudinal wall pipe, frame iron and water wall tube spot weld cracks. Reason: The damaged part is in the high temperature zone of the second plenum of the furnace. When the door is closed, the part is exposed to high temperature radiation (when the coal type is poor, the pressure in the hearth chamber runs more seriously); the door frame iron is heated and expanded; When the furnace door, cold air into the rapid cooling of the welding parts, rapid cooling frame iron. such